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Strangely, IMO legacy versions of OpenGL often seem to perform better and with fewer bugs in MS Windows that legacy versions of DirectX. I don't know about Vulkan vs DX12 though, I think that might be more of a draw. The world might be better off if Microsoft completely ditched DirectX and only provided decent legacy support going forward…
OpenGL is the premier environment for developing portable, interactive 2D and 3D graphics applications. Developed by Khronos Group. License: Open Source. Categories: Development Photos & Graphics. Apps available for Mac OS X Windows Linux. Visit Website. OpenGL Alternatives. Microsoft DirectX VS OpenGL Feature comparision.
The structure of Direct3D, and DirectX in general, is hugely different from OpenGL. As time goes on however, DirectX is slowly becoming more and more like OpenGL. I won't show all the class diagrams here, but basically, DirectX is based on the COM object model.
In conclusion, DirectX and OpenGL are two powerful graphics APIs that offer different features, performance characteristics, and platform compatibility. When choosing between them for gaming, consider factors such as the target platform, required optimizations, and development tools available.